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1、Overvoltage research status Mechanism of ferromagnetic resonance at home and abroad has been exhaustive research, the main reason is when the voltage increases, (then, Of closing the persistent failure resection can cause), PTs core saturation, the inductive reactance XmLine-to-ground capacitance or
2、 circuit breaker equalizing the capacitance of the capacitor and capacitor equipment close to inspireSince a resonant frequency. In the power system to determine Ferromagnetic resonance occurs in any case will preventAnd analysis play a very important role. Opinion at home and abroad in accordance w
3、ith the above results of ferromagnetic resonance over-voltage are generally taken to prevent and eliminateMethods, prevention and to eliminate ferroresonance over-voltage is generally considered from two aspects of the running operation, equipment. From running operation Considerations during operat
4、ion ferroresonance over-voltage, the operation of the equipment or line Road re ored to the state before the operation, and then re-operate. The bus charging power ShiningHub circuit breaker, and then close thenTransformer or voltage transformer and inductor device on the bus. Ferromagnetic resonanc
5、e occurs in the operation, the temporary investment ofInto the arc suppression coil or specified in advance some of the lines or equipment, such as shunt capacitor banks or standby line. From the deviceConsiderations, (1) in the star connection voltage transformer primary winding neutral point and g
6、round installation of harmonic elimination, such as:-6-35 type LXQ (Resistor R), R in series by a SiC non-linear resistor and a linear resistor (6 7k), thisSample can directly absorb vibration energy, to prevent resonance occurs, this damping method is particularly suitable for large capacitance onG
7、rid; (2) the original electromagnetic voltage transformer triangular openings at both ends of the winding (secondary side) access harmonic elimination installedSet, such as: 10kV and 35kV voltage transformer, respectively, then WNx-II / 10, and WNx of-II / 60 type MicroelectronicsBrain multi-functio
8、n harmonic elimination, which can eliminate the fundamental resonance, but also to eliminate high-order harmonic and sub-harmonic resonance, this Measures particularly suitable for small-to-ground capacitance grid; (3) between the TV and high-voltage voltage transformer neutral point and ground stri
9、ngThe phase voltage transformer TV0 of orders, TV0 TV same model, ground signal voltage from TV0 secondary acquisition. On the one hand, the general external excitation can not make the TV into the saturated zone; the other hand TV0 high voltage winding DC resistance of approximately10k, the resonan
10、t strong damping effect, a measure that is suitable for a variety of distribution networks; (4) 10 to 35 kV powerThe pressure transformer used in all the harmonic elimination voltage transformer. More than the prevention and elimination of ferroresonance over-voltage methods and measures, to some ex
11、tent, the system can eliminateThe ferromagnetic resonance over-voltage, but not well determine the type of ferromagnetic resonance, measures for eliminationThe process tends to cause unnecessary waste, and may even expand the occurrence of ferroresonance over-voltage. At the present stageAll areas i
12、n research, how to determine by calculation or simulation power system ferroresonance over-voltage class Type, the final choice harmonic elimination measures.Is still in a research point of view, whether domestic or foreign, for the substation ferromagnetic overvoltage simulation analysisStudy stage
13、, there is little research institutions or units of the entire substation simulation, and most of them are just pinAn interval of substation, an outlet to the simulation, the simulation results and the actual results have some access it is difficult to be corrected; basically use a lumped parameter
14、model from the model, and use the set parameters in model of the entire substation ferroresonance over-voltage tends to ignore the distributed capacitance and distributed inductance and other . The items distributed parameter influence on the results. 国内外对铁磁谐振的机理已有详尽的研究，其主要原因是当电压升高时，（接地、不同期合闸，持续性故障的
15、切除等，均可引起），PT的铁芯饱和，其感抗Xm下降，而与线路对地电容或断路器均压电容等电容型设备的容抗接近时，即可激发起某一频率下的谐振。在电力系统中，判断在任何情况下会发生铁磁谐振将对预防和分析起到十分重要的作用。 按照上面得出的观点国内外对于铁磁谐振过电压一般都是采取预防和消除的方法，预防和消除铁磁谐振过电压一般从运行操作、设备两方面考虑。从运行操作方面考虑，如果在操作过程中发生铁磁谐振过电压，可立即把操作过的设备或者线路恢复到操作前状态，然后重新进行操作。母线充电时，先合电源断路器，再合接在母线上的变压器或电压互感器等电感设备。在运行中发生铁磁谐振时，可临时投入消弧线圈或事先规定的某些线
16、路或设备，如并联电容器组或备用线路等。从设备方面考虑，在电压互感器一次绕组星形接线的中性点与地间加装消谐器如：LXQ-6-35型（电阻R），R由SiC非线性电阻和线性电阻（67k）串联组成，这样可直接吸收振荡能量，阻止谐振发生，这种阻尼方式特别适合于对地电容较大的待添加的隐藏文字内容3电网；在原有的电磁式电压互感器的开口三角绕组两端（即二次侧）接入消谐装置，如：在10kV和35kV电压互感器分别接WNX/10和WNX/60型微电脑多功能消谐器，这样可消除基波谐振，又可消除高次谐波和分次谐波谐振，这一措施特别适合对地电容较小的电网；在电压互感器TV的高压中性点与地之间串接单相电压互感器TV0，T
17、V0与TV同型号，接地信号电压可从TV0二次取得。一方面，一般外部激发不能使TV进入饱和区；另一方面TV0高压绕组的直流电阻约为10k，对谐振有强烈的阻尼作用，这一措施适合于各种配电网；1035kV电压互感器全部采用消谐型电压互感器。 以上预防和消除铁磁谐振过电压的方法和措施，在一定程度上可以消除系统中的铁磁谐振过电压，但由于不能很好的判断出铁磁谐振的类型，在采用消谐措施的过程中往往会造成不必要的浪费，甚至可能会扩大铁磁谐振过电压的发生。现阶段各个领域都在研究，如何通过计算或仿真来确定电力系统发生铁磁谐振过电压的类型，最终选择消谐措施。无论是国内还是国外，就针对变电站铁磁过电压仿真分析来看，还处于一个研究阶段，很少有研究机构或单位进行整个变电站仿真，而他们大部分情况都只是针对变电站一个间隔、一条出线来进行仿真，仿真的结果与实际结果有一定的出入，而且很难进行修正；从建立的模型来看，基本上都是使用集中参数模型，而使用集中参数模型研究整个变电站的铁磁谐振过电压往往会忽略分布电容、分布电感等各项分布参数对结果的影响。
